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Evaporating and crystallizing zero-discharge treatment system and method for high-COD waste water

A treatment system, evaporation and crystallization technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem of increased energy consumption, reduced heat exchange efficiency of heat exchange equipment, inability to Achieve zero emission and other issues, achieve stable operation, high cleaning efficiency, and high preheating efficiency

Active Publication Date: 2015-09-23
BEIJING BIOTECHINA ENVIRONMENT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The above-mentioned technologies have been applied in domestic wastewater treatment projects, and have a certain amount of engineering achievements in the treatment of high COD wastewater, but most of them have the following problems during operation: 1. There is a certain amount of high-concentration mother liquor discharged, and Real zero discharge cannot be achieved; 2. The organic content in the obtained crystalline salt is high and cannot be recycled and utilized; 3. The discharged mother liquor and high-COD crystalline salt are solid waste or hazardous waste and need to be further treated, which is difficult and expensive High; 4. The existing evaporative crystallizer is composed of a large number of heat exchange equipment. The existence and accumulation of organic matter in wastewater will reduce the heat exchange efficiency of heat exchange equipment and increase energy consumption; 5. The existence and accumulation of organic matter in wastewater will also reduce Increased difficulty of salt cleaning in crystallizers

Method used

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  • Evaporating and crystallizing zero-discharge treatment system and method for high-COD waste water
  • Evaporating and crystallizing zero-discharge treatment system and method for high-COD waste water
  • Evaporating and crystallizing zero-discharge treatment system and method for high-COD waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Adopt the above-mentioned processing system and processing method of the present invention to process the ethylene alkali slag waste liquid that certain enterprise produces, waste liquid amount 25m 3 / h, its water quality is shown in Table 1:

[0042] Table 1 Water quality of ethylene alkali slag waste liquid in an enterprise

[0043]

[0044]

[0045] Note: The salt contained is divided into sodium sulfate.

[0046] It can be seen from Table 1 that the wastewater has the characteristics of high organic matter content, complex composition and refractory degradation. According to the characteristics of waste water, the present invention adopts such as figure 1 The shown treatment process, that is, the conditioning unit 7 is arranged between the preheater 1 and the evaporator 3 . Its processing includes:

[0047] 1) The waste lye with an inlet water temperature of 30°C is lifted by the feed pump and enters the preheater 1 to be preheated to 80°C, then enters the...

Embodiment 2

[0054] The high-salt wastewater obtained by a chemical enterprise through pretreatment, membrane concentration, and salt separation is treated by using the treatment system and treatment method as described above in the present invention, and the amount of salt water is 150m 3 / h, its water quality is shown in Table 2:

[0055] Table 2 Salt water quality of a chemical enterprise

[0056]

[0057] Note: The salt contained is divided into sodium sulfate.

[0058] According to the water quality characteristics of the salt water of table 2, the present embodiment adopts such as figure 2 The treatment process shown, that is: the conditioning unit 7 is arranged between the water outlet of the concentrated solution of the evaporator 3 and the water inlet of the crystallizer 4, and the present embodiment adopts three such as figure 2 Wastewater is treated in the manner of the treatment system shown, and the treatment process of a single treatment system includes:

[0059] 1) T...

Embodiment 3

[0065] Adopt the above-mentioned treatment system and treatment method of the present invention to treat the high-salt wastewater obtained after the ion-exchange regeneration waste liquid of an enterprise is pretreated and membrane-concentrated, and the amount of salt water is 16m 3 / h, its water quality is shown in Table 3:

[0066] Table 3 Salt water quality of an enterprise

[0067]

[0068] Note: The salt content is mainly sulfur calcium chloride, magnesium chloride, sodium chloride.

[0069] According to the water quality characteristics of the salt water of table 3, the present embodiment adopts such as image 3 The shown treatment process, that is: the conditioning unit 7 is located between the water outlet of the mother liquor tank 6 and the water inlet of the crystallizer 5, and the treatment process of the treatment system includes:

[0070] 1) The waste lye with an inlet water temperature of 30°C is lifted by the feed pump into the preheater 1 to be preheated t...

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Abstract

The invention discloses an evaporating and crystallizing zero-discharge treatment system and method for high-COD waste water. The system comprises a preheater, an evaporator, a crystallizer, a centrifugal separator, a mother liquor tank and a quality adjusting unit, a water inlet and a water outlet of the preheater are connected with raw waste water and a water inlet of the evaporator respectively, concentrated liquor generated by evaporation of the evaporator enters the crystallizer, crystal slurry generated by the crystallizer enters the centrifugal separator, mother liquor generated by centrifugal separation of the centrifugal separator returns to the crystallizer, crystallized salt generated by separation is discharged or recycled, and the quality adjusting unit removes COD in the waste water through electrocatalytic oxidation and is arranged between the water outlet of the preheater and the water inlet of the evaporator, or between a concentrated liquor water outlet of the evaporator and a water inlet of the crystallizer or between a water outlet of the mother liquor tank and the water inlet of the crystallizer. The system can realize zero discharge truly under the premise of running stably for a long time.

Description

technical field [0001] The invention relates to a waste water treatment system and a treatment method, in particular to a waste water evaporation and crystallization zero discharge treatment system and treatment method capable of high COD, and belongs to the field of environmental protection water treatment. Background technique [0002] With the introduction of the concept of "zero discharge" in wastewater treatment, evaporation crystallization technology has been widely used in the field of saline wastewater treatment. At present, saline wastewater is mainly treated by the process of pretreatment + membrane concentration + evaporation and crystallization. As the terminal step of wastewater treatment, the evaporation crystallization step mainly adopts mechanical vapor recompression technology and multi-effect evaporation technology. [0003] The above-mentioned technologies have been applied in domestic wastewater treatment projects, and have a certain amount of engineerin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
Inventor 李国文张悦包长春王彦成李庆张学辉
Owner BEIJING BIOTECHINA ENVIRONMENT CORP
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